easyui高级控件_01

程序员文章站 2024-02-03 22:01:28

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1.首先思考：我们想一个用户对应多个菜单
然后一个菜单可以对应多个用户
其实这就是user与menu的多对多的关系

思路：
1、菜单不同的原因在于，利用不同menuid进行查询，原本默认查询的是所有菜单，是通过-1去查的；
2、menuid由来：是登录用户id查询中间表数据所得来的

下面进行代码验证：
先修改menuDao
这里增加了一个 listMenuSef，利用不同menuid进行查询，这样就不会影响其他的方法好了思路的第一步完成了

package com.zrh.dao;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.zrh.entity.TreeNode;
import com.zrh.util.JsonBaseDao;
import com.zrh.util.JsonUtils;
import com.zrh.util.PageBean;
import com.zrh.util.StringUtils;

public class MenuDao extends JsonBaseDao {
	/**
	 * 
	 * @param map   req.getParameterMap
	 * @param pageBean  分页
	 * @return
	 * @throws SQLException 
	 * @throws IllegalAccessException 
	 * @throws InstantiationException 
	 */
	public List<TreeNode> list(Map<String, String[]> map,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
		List<Map<String, Object>> listMenu = this.listMenuSef(map, pageBean);
		List<TreeNode> treeNodeList = new ArrayList<>();
		menuList2TreeNodeList(listMenu,treeNodeList);
		return treeNodeList;
		
	}
	
	
	public List<Map<String, Object>> listMenuSef(Map<String, String[]> map,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
		String sql ="select * from t_easyui_menu where true";
		String id = JsonUtils.getParamVal(map, "menuHid");
		if(StringUtils.isNotBlank(id)) {
			sql = sql + " and Menuid in ("+id+") ";
		}else {
			sql = sql + " and Menuid = -1";
		}
		return super.executeQuery(sql, pageBean);
		
	}
	/**
	 * 查询menu表的数据
	 * @param map
	 * @param pageBean
	 * @return
	 * @throws SQLException 
	 * @throws IllegalAccessException 
	 * @throws InstantiationException 
	 */
	//查东西不一定返回对象 可以返回map集合   JsonUtils是jquery里的工具类
	public List<Map<String, Object>> listMenu(Map<String, String[]> map,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
		String sql ="select * from t_easyui_menu where true";
//		String id = JsonUtils.getParamVal(map, "id");//首先拿到当前节点的id
		String id = JsonUtils.getParamVal(map, "id");
		if(StringUtils.isNotBlank(id)) {
			sql = sql + " and parentid = "+id;
		}else {
			sql = sql + " and parentid = -1";
		}
		return super.executeQuery(sql, pageBean);
		
	}
	
	/**
	 * menu表的数据不符合easyui树形展示的数据格式
	 * 需要转换成easyUI所能识别的数据
	 * @param map
	 * @param treeNode
	 * @throws SQLException 
	 * @throws IllegalAccessException 
	 * @throws InstantiationException 
	 */
	private void menu2TreeNode(Map<String, Object> map,TreeNode treeNode) throws InstantiationException, IllegalAccessException, SQLException {
		treeNode.setId(map.get("Menuid").toString());
		treeNode.setText(map.get("Menuname").toString());
		treeNode.setAttributes(map);
		
		Map<String, String[]> jspMap = new HashMap<>();
		jspMap.put("id", new String[] {treeNode.getId()});
		List<Map<String, Object>> listMenu = this.listMenu(jspMap, null);
		List<TreeNode> treeNodeList = new ArrayList<>();
		menuList2TreeNodeList(listMenu,treeNodeList);
		treeNode.setChildren(treeNodeList);
	}
	
	private void menuList2TreeNodeList(List<Map<String, Object>> mapList,List<TreeNode> treeNodeList) throws InstantiationException, IllegalAccessException, SQLException {
		TreeNode treeNode = null;
		for (Map<String, Object> map : mapList) {
			treeNode = new TreeNode();
			menu2TreeNode(map,treeNode);
			treeNodeList.add(treeNode);
		}
		
	}

}

2、menuid由来：是登录用户id查询中间表数据所得来的
先写一个方法UserDao用来查询，第一个是登录查询用户表，第二个是通过中间表查询登录用户所对应的权限

package com.zrh.dao;

import java.sql.SQLException;
import java.util.List;
import java.util.Map;

import com.zrh.util.JsonBaseDao;
import com.zrh.util.JsonUtils;
import com.zrh.util.PageBean;
import com.zrh.util.StringUtils;

public class UserDao extends JsonBaseDao {
	public List<Map<String, Object>> list(Map<String, String[]> paMap,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
		String sql = "select * from t_easyui_user_version2 where true";
		String uid = JsonUtils.getParamVal(paMap, "uid");
		String upwd = JsonUtils.getParamVal(paMap, "upwd");
		if(StringUtils.isNotBlank(uid)) {
			sql = sql + " and uid = "+uid;
		}
		if(StringUtils.isNotBlank(upwd)) {
			sql = sql + " and upwd = "+upwd;
		}
		return super.executeQuery(sql, pageBean);
		
	}
	
	/**
	 * 通过中间表查询登录用户所对应的权限
	 * @param paMap
	 * @param pageBean
	 * @return
	 * @throws InstantiationException
	 * @throws IllegalAccessException
	 * @throws SQLException
	 */
	public List<Map<String, Object>> listMenu(String uid,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
		String sql = "select * from t_easyui_usermenu where true";
		if(StringUtils.isNotBlank(uid)) {
			sql = sql + " and uid = "+uid;
		}
		return super.executeQuery(sql, pageBean);
		
	}

}

然后写一个UserAction
可以自动调用

package com.zrh.web;

import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.zking.framework.ActionSupport;
import com.zrh.dao.UserDao;

public class UserAction extends ActionSupport {
	private UserDao userDao = new UserDao();
	
	public String login(HttpServletRequest req,HttpServletResponse resp) {
		try {
			List<Map<String, Object>> list = this.userDao.list(req.getParameterMap(), null);
			if(list != null && list.size() > 0) {
				//listMenu查出来的是中间表对应的所有权限
				List<Map<String, Object>> listMenu = this.userDao.listMenu(req.getParameter("uid"), null);
				StringBuilder sb = new StringBuilder();
				for (Map<String, Object> map : listMenu) {
					sb.append(","+map.get("menuId"));
				}
				req.setAttribute("menuHid", sb.substring(1));
			}else {
				return "login";
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return "index";
		
	}

}

去mvc.xml配置下，代码如下

<action path="/userAction" type="com.zrh.web.UserAction">
		<forward name="index" path="/index.jsp" redirect="false" />
	</action>

完了之后写一个登录界面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/userAction.action?methoName=login" method="post">
	uid:<input type="text" name="uid"><br>
	upwd:<input type="password" name="upwd"><br>
	<input type="submit" ><br>
</form>
</body>
</html>

输出结果为：
登录界面：
easyui高级控件_01

登录进去后，进入主界面：
easyui高级控件_01

总结：
分了权限之后，每个用户登录后都可以跳到不同界面去，解决了一个菜单不能对应多个用户的问题。

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